Denominator of the Harary number for the cycle graph C_n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =6a(7) =3a(8) =4a(9) =6a(10) =60a(11) =5a(12) =20a(13) =10a(14) =28a(15) =35a(16) =280a(17) =140a(18) =2520a(19) =126a(20) =120a(21) =1260a(22) =27720a(23) =1155a(24) =5544a(25) =13860a(26) =40040a(27) =12870a(28) =360360a(29) =12012